Fine-tooth ratcheting mechanism allows bands to be contracted in small increments. Set contains fine-tooth ratcheting pliers and nine different size bands. Used to compress and install piston rings. Compression band sizes:. 2-1/8"-2-3/8". 2-3/8"-2-5/8". 2-5/8"-2-7/8". 2-7/8"-3-1/8". 3-1/8"-3-3/8". 3-5/8"-3-7/8". 3-7/8"-4-1/8". 4-1/8"-4-3/8".
